Commutator-segment mounting



W. E. RICHTER.

COMMUTATOR SEGMENT MOUNTING. APPLICATION FILED Aus.8, 1917.

1,426,105. at nted Aug- 15, 1922..

III/Ill!) null-ll 6 Hum 01 UNITED STATES PATENT OFFICE.

WALTER E. RICHTER, OF TOLEDO, OHIO,- ASSIGNOR TO ELECTRIC AUTO-IITE CORPO- RATION, OF TOLEDO, OHIO, A CORPORATION OF DELAWARE.

COMMUTATOR-SEGMENT MOUNTING.

Specification of Letters Patent. Patented Aug. 15, 1922.

Application filed August 8, 1917-. Serial No. 185,082.

porting tube, which will perfectly position the segments and will furnish a support for the edges of the segments without endangering the splitting thereof due to forcing the locking ring too far into the notch formed in the ends of the segments.

Further objects of this invention relate to economies of manufacture and details of construction as will hereinafter appearfrom the detailed description to follow. I accomplish the objects of my invention in one instance by the devices and means describedin the following specification, but it is evident that the same may be varied widely without departing from the scope of the invention as pointed out in the appended claims. A structure constituting one em.- bodiment of my invention, which may be the preferred, is illustrated in the accompanying drawings forming a part thereof, in which:

Figure I is a side view of an armature embodying a commutator, the segments of which are mounted in accordance with my invention.

Fig. II is a sectional view of the commu tator taken substantially on the line II-II of Figure I.

Fig. III is a view similar to Fig. II showing the locking ring in position before the outer edge thereof has been forced outwardly to form a support for the end portions of the segments, and showing a tool by means of which the outer edge of the locking ring can thus be forced outwardly.

In the drawings, similar reference numerals refer tosimilar parts throughout the several views, and the sectional view is taken looking inthe direction of the little arrows at the ends of the section line.

Considering the numbered parts of the drawings, the armature 10 is mounted on the shaft 11 and is provided with a commutator 12, which is made up of a plurality of segments 13, having the radially extending portions 14, said segments being mounted on the supporting tube 15, which is mounted on the armature shaft. V-shaped notches 16 are formed in each end of each segr'nent 13, said notches having an inner inclined face, and an outer face which is concentric with the outer face of the segment. The segments are held in place by the locking rings 17 which are substantially V-shaped in cross-section and each of which has one surface engaging the inclined side of the notch 16, in order to position the segments laterally on' the supporting tube, and another surface which extends substantially concentric with the face of the commutator 5 segment. This latter surface is slightly spaced from the commutator segments, especially near the bottom of the V-shaped notch thereof, but the outer edge of the looking ring is forced outwardly at 18 and forms a support for the end portions of the segments. This clearly appears from Figure II of the drawing.

Insulating material 19 is disposed between the locking rings 17 and the segments 13 as well as between the segments and the tube 15 and the segments are held in place on the supporting tube 15, together with the looking rings, by spinning the edges of the supporting tube over the inner edges of the locking rings, as at 20. In Figure III, I have shown the locking rings in place before the rear edges thereof are forced out wardly to form a support for the rear edges of the commutator segments, and I have shown a tool 22 provided with an annular tapered end 21, which fits within the notch of the locking ring, and is adapted to force the rear edge thereof outwardly to form the support for the segments.

From the description of the parts given above, the operation of my device should be very readily understood. It has heretofore been customary to use a solid locking ring, which fits in the notches; formed in the ends of the segments, and positions them laterally and at the same time supports the segments. Since this locking ring is solid, however, it often happens that the commutator segments are split, due to forcing the ring too far into the notch. By using the mounting, which I have here shown and described,

this trouble is avoided, as the locking ring cannot be forced in so far so as to split the segments, and the support for the end portions of the segments is formed by forcing the outer edge of the locking ring outwardly after the segments have been positioned and the locking ring has been secured in place by spinning the edges of the supporting tube around the same. This mounting affords a very desirable supporting means for the ends of the segments, and, to a large extent, prevents the injuring ot the segments when the locking ring is forced into place.

Having thus described my invention, What I claim. as new and desire to secure by Letters Patent is:

' 1. In a device of the class described, the combination of a supporting member; a plurality of segments mounted thereon; each segment having a notch in the end thereof; a locking ring on said member, engaging one side of each of said notches to position the segments, the inner edge of the ring being slightly spaced from the other side of each of said notches, and the outer edge of said ring being bent radially to form. a support for the outer ends of the segments.

2. In a device of the class described, the combination of a supporting member; a plurality of segments mounted thereon, each segment having a notch in the end thereof; and a locking ring fixed on said member, and positioned against said segments; the

outer edge of said ring being bent radially to form. a support for the outer ends of the segments.

3. In a device of the class described, the combination of a supporting member, a plurality of segments mounted thereon, each segment having a. notch in the end thereof; and a pair of locking rings mounted on said member, the outer edges of said rings being bent radially to support the outer ends of the segments.

4. In a device of the class described, the combination of a supporting member; a plurality of segments mounted thereon, each segment having a notch in the end thereof; and a locking ring mounted on said member, the outer edge of said ring being bent radially to support the ends of the segments.

5. In a device of the class described, the combination of a supporting tube, a series of commutator segments mounted thereon each having an inwardly projecting dove tail projection, a air of rings secured to opposite ends of said tube and firmly engaging the sides of said projections, said rings also engaging the body port-ions of said segments at their ends but spaced therefrom at those portions adjacent said projections, each of said segments being completely insulated from the other members of the structure.

In testimony whereof I aflix my signature.

WALTER E. RICHTER. 

